Olfactory investigation in the home cage

Area of Science:

• Neuroscience
• Animal Behavior

Background:

• Investigating olfactory perception is crucial for understanding sensory processing.
• Existing methods often require extensive training or specific task structures.
• Studying naturalistic olfactory investigation in rodents requires adaptable behavioral paradigms.

Purpose of the Study:

• To develop and validate a novel behavioral paradigm for studying volitional olfactory investigation in mice.
• To assess the long-term engagement and learning capabilities related to olfactory stimuli in mice.
• To provide a system for naturalistic olfactory learning research outside conventional task constraints.

Main Methods:

• A behavioral setup was created with odor ports in a standard mouse cage.
• Mice freely interacted with odor ports delivering neutral odorants.
• Sampling behavior, habituation, and responses to unexpected odorants were recorded.
• The paradigm allowed for multi-month observation of olfactory investigation.

Main Results:

• Mice voluntarily sampled odor stimuli hundreds of times daily, demonstrating high engagement.
• Olfactory investigation persisted for weeks with minimal habituation after initial exposure.
• Exposure to unexpected odorants led to a transient, significant increase in sampling rate, indicating learning.
• Sustained elevated sampling rates post-novelty suggest implicit knowledge acquisition.

Conclusions:

• The developed paradigm effectively supports the study of volitional olfactory investigation in mice.
• This system facilitates research on naturalistic olfactory learning over extended timescales.
• The findings highlight mice's innate curiosity and learning capacity in response to olfactory cues.